Mechanical Behavior of a Textile Polyester Vascular Prosthesis: Theoretical                 and Experimental Study

Abdessalem, Saber Ben; Mokhtar, Sofiene; Belaissia, Habib; Filali, Nabila; Durand, Bernard

doi:10.1177/0040517505057168

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…Although moulds were used to crimp knitted vascular grafts [20][21][22], the crimping process applied in this project is based on the buckling of tubular sleeves, sliding over an internal cylindrical mandrel under axial compression. An inert mandrel of diameter 2-5 mm smaller than the nominal braid diameter was inserted inside the braided tubular structure.…”

Section: Materials and Crimping Proceduresmentioning

confidence: 99%

Crimped braided sleeves for soft, actuating arm in robotic abdominal surgery

Elsayed

Lekakou

Ranzani

et al. 2015

Minimally Invasive Therapy & Allied Technologies

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Background: This paper investigates different types of crimped, braided sleeve used for a soft arm for robotic abdominal surgery, with the sleeve required to contain balloon expansion in the pneumatically actuating arm while it follows the required bending, elongation and diameter reduction of the arm.Methods: Three types of crimped, braided sleeves from PET (BraidPET) or nylon (BraidGreyNylon and BraidNylon, with different monofilament diameter) were fabricated and tested including geometrical and microstructural characterisation of the crimp and braid, mechanical tests and medical scratching tests for organ damage of domestic pigs.Results: BraidPET caused some organ damage, sliding under normal force of 2-5 N; this was attributed to the high roughness of the braid pattern, the higher friction coefficient of polyethylene terephthalate (PET) compared to nylon, and the high frequency of the crimp peaks for this sleeve. No organ damage was observed for the BraidNylon, attributed to both the lower roughness of the braid pattern and the low friction coefficient of nylon. BraidNylon also required the lowest tensile force during its elongation to similar maximum strain as that of BraidPET, translating to low power requirements. Conclusion:BraidNylon is recommended for the crimped sleeve of the arm designed for robotic abdominal surgery.

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Section: Materials and Crimping Proceduresmentioning

confidence: 99%

Crimped braided sleeves for soft, actuating arm in robotic abdominal surgery

Elsayed

Lekakou

Ranzani

et al. 2015

Minimally Invasive Therapy & Allied Technologies

View full text Add to dashboard Cite

show abstract

“…They are also utilized as biomaterials as synthetic vascular grafts being intensively used in vascular system surgery [5], among others they are used as bypasses to derive blood circulation or to replace failed blood vessels [6][7][8][9][10]. Many researchers have done wonderful work on polyester material [11][12][13][14] but very little has actually focused on optimizing the property of polyester foam by investigating the influence of additives on the properties of the resulting polyester foam.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Properties of Polyether Based Polyurethane Foam

Aramide¹,

Atanda²,

Olorunniwo³

2013

OJPChem

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Effect of different chemicals and additives used in producing polyester foam was investigated. Reference samples were produced from polyol, toluene di isocyanate (TDI), amine stannous octoate distil water, and silicone oil using laboratory mix formulation based on 500 g polyether based polyol. Other samples were produced by consecutively varying the content of all the additives with the exception of polyol. Standard sample dimensions for density test, indentation test, compression set test, tensile strength and elongation tests were produced from the samples. The various tests were carried out on the samples using the ASTM-D3574 standards. It was observed that the degree of indentation affects the value of indentation hardness and increasing the percentage content of TDI results in acceptable compression set value for the polyester samples. It was concluded that Holding all other parameters constant, reducing the water content and increasing the TDI content will yield polyester foam of optimum properties.

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“…Crimping gives grafts a bending flexibility and kink resistance, and a longitudinal compliance (Abdessalem et al, 2005b). These mechanical features prevent the collapse of prosthetic grafts implanted in axillary femoral and popliteal regions, where joint motion may cause the grafts to bend.…”

Section: Introductionmentioning

confidence: 99%